LAMBDA , XI AND OMEGA PRODUCTION AT MID-RAPIDITY IN PB-PB AND P-PB COLLISIONS AT 158 A GEV/C

Λ, Ξ and Ω yields and transverse mass spectra measured at central rapidity in Pb-Pb and p-Pb collisions at 158 A GeV/c are presented. The yields in Pb-Pb interactions are given as a function of the collision centrality and compared with those obtained from p-Pb collisions. The dependence of hyperon yields on the centrality of the impact and on the strangeness content of the hyperon are discussed.